Added the promised test case.

into  chilla.local:/home/mydev/mysql-5.1-bug22119

into  chilla.local:/home/mydev/mysql-5.0-bug22119

When compiling with a default key block size greater than the
smallest key block size used in a table, checking that table
failed with bogus errors. The table was marked corrupt. This
affected myisamchk and the server.

The problem was that the default key block size was used at
some places where sizes less or equal to the block size of the
index in check was required.

We do now use the key block size of the particular index
when checking.

A test case is available for later versions only.

into  mysql.com:/home/svoj/devel/mysql/engines/mysql-5.1-engines

into  mysql.com:/home/svoj/devel/mysql/engines/mysql-5.0-engines

into  mysql.com:/home/svoj/devel/mysql/engines/mysql-4.1-engines

into  mysql.com:/home/svoj/devel/mysql/engines/mysql-4.1-engines

into  chilla.local:/home/mydev/mysql-5.1-merge

Backport from 5.1.
Raised STACK_MIN_SIZE for Debian GNU/Linux Sid,
Linux kernel 2.6.16,
gcc version 3.3.6 (Debian 1:3.3.6-13),
libc6-dbg 2.3.6.ds1-4,
Pentium4 (x86),
BUILD/compile-pentium-debug-max
Raised about 100 Bytes above the required minimum.

into  chilla.local:/home/mydev/mysql-5.1-merge

into  chilla.local:/home/mydev/mysql-5.1-merge

into  chilla.local:/home/mydev/mysql-5.0-merge

into  chilla.local:/home/mydev/mysql-5.0-merge

into  chilla.local:/home/mydev/mysql-4.1-merge

into  mysql.com:/data0/bk/mysql-5.0-kt

Repair table could crash a server if there is not sufficient
memory (myisam_sort_buffer_size) to operate. Affects not only
repair, but also all statements that use create index by sort:
repair by sort, parallel repair, bulk insert.

Return an error if there is not sufficient memory to store at
least one key per BUFFPEK.

Also fixed memory leak if thr_find_all_keys returns an error.

into  mysql.com:/home/hf/mysql-5.1.mrg

into  chilla.local:/home/mydev/mysql-4.1-bug12240

into  dator5.(none):/home/pappa/bug18198

into  chilla.local:/home/mydev/mysql-5.0-bug12240

into  chilla.local:/home/mydev/mysql-5.1-bug12240

into  chilla.local:/home/mydev/mysql-5.1-bug12240

into  chilla.local:/home/mydev/mysql-5.0-bug12240

into  chilla.local:/home/mydev/mysql-4.1-bug12240

into  chilla.local:/home/mydev/mysql-5.1-ateam

into  moonlight.intranet:/home/tomash/src/mysql_ab/mysql-4.1-bug9678

into  moonlight.intranet:/home/tomash/src/mysql_ab/mysql-5.1-real

into  moonlight.intranet:/home/tomash/src/mysql_ab/mysql-5.0-real

into  moonlight.intranet:/home/tomash/src/mysql_ab/mysql-4.1-bug9678

into  mysql.com:/home/hf/mysql-5.1.mrg

into  mysql.com:/home/hf/mysql-5.0.mrg

into  chilla.local:/home/mydev/mysql-4.1-bug8283-one

into  chilla.local:/home/mydev/mysql-5.0-bug8283

            hangs on Linux

If REPAIR TABLE ... USE_FRM is issued for table that is located in different
than default database server crash could happen.

In reopen_name_locked_table take database name from table_list (user specified
or default database) instead of from thd (default database).

Affects 4.1 only.

Added proper casts

No test case. myisampack must be tested manually.